PNG ICO ICNS MORE
Free icons for Windows8/Metro
Brain
DarkSlateGray
512x512
2001 Space Odyssey
Key, password, hal
128x128
Education & science
Glyph
Brain Games
Games, grey, Brain
1042x1042
Files & folders
Smooth
Pry Frente Black Special
256x256
Mixed
Pixel
PC 100 Icon Pack
Thinking, Brainstorm, think
32x32